ImageCapture.getPhotoSettings() - Web APIs 编辑

The getPhotoSettings() method of the ImageCapture interface returns a Promise that resolves with a PhotoSettings object containing the current photo configuration settings.

Syntax

const settingsPromise = imageCapture.getPhotoSettings()

Return value

A Promise that resolves with a PhotoSettings object containing the following properties:

• fillLightMode:  The flash setting of the capture device, one of "auto", "off", or "on".
• imageHeight: The desired image height as an integer. The user agent selects the closest width value to this setting if it only supports discrete heights.
• imageWidth: The desired image width as an integer. The user agent selects the closest width value to this setting if it only supports discrete widths.
• redEyeReduction: A boolean indicating whether the red-eye reduction should be used if it is available.

Example

The following example, extracted from Chrome's Image Capture / Photo Resolution Sample, uses the results from getPhotoSettings() to modify the size of an input range. This example also shows how the ImageCapture object is created using a MediaStreamTrack retrieved from a device's MediaStream.

const input = document.querySelector('input[type="range"]');

var imageCapture;

navigator.mediaDevices.getUserMedia({video: true})
.then(mediaStream => {
  document.querySelector('video').srcObject = mediaStream;

  const track = mediaStream.getVideoTracks()[0];
  imageCapture = new ImageCapture(track);

  return imageCapture.getPhotoCapabilities();
})
.then(photoCapabilities => {
  const settings = imageCapture.track.getSettings();

  input.min = photoCapabilities.imageWidth.min;
  input.max = photoCapabilities.imageWidth.max;
  input.step = photoCapabilities.imageWidth.step;

  return imageCapture.getPhotoSettings();
})
.then(photoSettings => {
  input.value = photoSettings.imageWidth;
})
.catch(error => console.log('Argh!', error.name || error));

Specifications

Browser compatibility

BCD tables only load in the browser